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SURFACEVEHICLESTANDARD

J10REAF.

NOV2007

Issued 1959-05

Reaffirmed 2007-11

Superseding J10 FEB2000

(R) Automotive and Off-Highway Air Brake Reservoir Performance

and Identification RequirementsTruck and Bus

1. ScopeThis SAE Standard applies to all new production air brake reservoirs used in automotive vehicles andoff-road machines. This document defines an air brake reservoir as a reservoir having single or multiplecompartments that is used for storage of compressed air. This document does not apply to accumulators or

reservoirs for storage of gases other than compressed air.

The reservoirs tested per these requirements shall be selected from production stock and shall be equipped

with all permanently attached items such as mounting brackets and fitting bosses.

1.1 PurposeThe purpose of this document is to provide MINIMUM performance requirements and a method ofidentifying new production air brake reservoirs. Additional requirements for corrosion resistance and pressure

fatigue tests should be considered by the vehicle manufacturer. Additional or different considerations shouldbe given to non-metallic and non-circular reservoirs.

2. References

2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specified

herein. Unless otherwise indicated, the latest version of SAE publications shall apply.

2.1.1 ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.

ASTM B 117-95Operating Salt Spray (Fog) Apparatus

ASTM D 1654-92Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments

3. Certification requirements

3.1 Proof TestsAll air brake pressure reservoirs shall be capable of withstanding a hydrostatically applied

internal pressure of not less than five times the reservoir rated working pressure.

There shall be no indication of rupture or permanent circumferential deformation exceeding 1% after havingbeen subjected to this test pressure for 5 min.

When testing multiple compartment reservoirs, the pressure shall be applied to and exhausted from allcompartments simultaneously. Then pressurize each compartment individually to 1.5 times the indicated

rated working pressure to verify the baffle strength in both directions.

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3.2 FMVSS Conformance (Off-Highway Applications need not comply)Initially and at a continuing

frequency of not less than once annually, one or more air brake reservoirs of each size, type (singlecompartment, multiple compartment, dual compartment with integral check valve) and mounting configuration

must be tested for compliance to all requirements of applicable Federal Motor Vehicle Safety Standards.

4. Performance Requirements

4.1 Leakage TestsEach air brake reservoir shall be capable of the following applicable tests. When air pressure

is used to perform this test, protection against explosive rupture shall be provided. The effectiveness of theprotective enclosure shall be verified prior to use. A sealing compound may be used to seal port threads.

4.1.1 SINGLE COMPARTMENT RESERVOIRSAll air reservoirs shall be subjected to twice the indicated rated working

pressure. Leakage shall not exceed 20 std cm3/m.

4.1.2 MULTIPLE COMPARTMENT RESERVOIRSWITHOUT CHECK VALVES

4.1.2.1 Reservoir ShellPerform the same test as in 4.1.1 by applying the pressure to and exhausting from all

compartments simultaneously.

4.1.2.2 Reservoir Baffle Plate(s)Check for leakage and weld integrity of the internal baffle plate(s) by applying apressure equal to the indicated rated working pressure to one side of the baffle plate(s). Leakage shall notexceed 20 std cm3/m.

4.1.3 DUAL COMPARTMENT RESERVOIRSWITH INTEGRAL CHECK VALVES

4.1.3.1 Reservoir ShellPerform the same test as in 4.1.1 except the pressure must be applied through the

supply (inlet) compartment and exhausted through the service (exhaust) compartment.

4.1.3.2 Reservoir Baffle PlatesPerform the same tests as in 4.1.2.2 by plugging the check valve closed when

required.

4.1.3.3 Check ValveWith a pressure equal to the indicated rated working pressure in both compartments,exhaust pressure from the supply compartment. The service compartment pressure must remain at the

rated working pressure. Leakage past the check valve shall not exceed 100 std cm3/m.

4.2 Corrosion TestAll air brake reservoirs shall be protected internally and externally against detrimental

corrosion through the use of either a corrosion-resistant base material or a suitable protective coating ortreatment. Any additional tests and requirements deemed important shall be agreed upon by purchaser and

seller.

4.2.1 EXTERIOR SURFACEThe exterior surface shall withstand a minimum of 48 h exposure to salt spray inaccordance with ASTM B 117-95. Upon completion of the exposure, evaluate the specimen per ASTM D1654-92. All maximum creepage points from the scribe are to be measured. A minimum of six

measurements are required on each side of the scribe (12 total). No one measurement greater than 3 mm is

permissible. No corrosion spots or blisters are permissible in the unscribed area (Rating Number 10). Smallopenings between mounting brackets and shells shall be disregarded in the corrosion evaluation. Also,edges or areas damaged in specimen preparation or purposely unpainted areas such as threads shall be

disregarded.

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4.2.2 INTERIOR SURFACEThe interior surface shall withstand a minimum of 96 h exposure to salt spray in

accordance with ASTM B 117-95. Upon completion of the exposure, evaluate the specimen per ASTM D1654-92. All maximum creepage points from the scribe are to be measured. A minimum of six

measurements are required on each side of the scribe (12 total). No one measurement greater than 3 mm ispermissible. No corrosion spots or blisters are permissible in the unscribed area (Rating Number 10).

Hidden lap areas such as end cap protrusion, internal baffle crevices, and fitting boss clearances shall be

disregarded in the corrosion evaluation. Also, edges or areas damaged in specimen preparation orpurposely unpainted areas such as threads shall be disregarded.

4.2.3 SPECIMEN PREPARATIONA production reservoir shall be quartered by cutting it in such a manner that each

section includes 50% of the end cap and 25% of the shell. The sectioned test reservoir should have aminimum of 72 h air exposure. Then the specimen shall be scribed in accordance with 5.1 of ASTM D 1654-

92. The specimen is then to be placed in the salt spray booth in a manner to provide thorough drainage andin accordance with Section 7 of ASTM B 117-95.

5. IdentificationAll air brake reservoirs which meet the requirements of this document shall be permanentlyidentified to show the manufacturer, SAE J10 plus latest revision, the rated working pressure and the date of

manufacture (day, month, and year). For example:

a. XYZ - SAE J10 XXX99 - 1034 kPa (150 psi) Rated Working Pressure - 150897

6. Notes

6.1 Marginal IndiciaThe change bar (l) located in the left margin is for the convenience of the user in locating

areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the leftof the document title indicates a complete revision of the report.

PREPARED BY THE SAE TRUCK AND BUS BRAKE SUPPLY AND CONTROL COMPONENTS

SUBCOMMITTEE OF THE SAE TRUCK AND BUS BRAKE COMMITTEE

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RationaleSAE J10 is currently written for steel reservoirs. Aluminum tanks are being used today an non-

metallic materials, such as fiber-reinforced plastics, are being considered. Sections 1.1 and 4.2 havebeen revised to indicate that SAE J10 is not limited to only steel reservoirs.

The current SAE J10 does not clearly define the pressure test requirements for multiple compartmentreservoirs. A proof test was added under 3.1 to verify baffle strength at 1.5 times the rated working

pressure. A 1.5 factor is a common requirement of many pressure vessel codes such as ASME. Theproduction test in 4.1.2.2 remains at the rated working pressure.

Most truck manufacturers require tests in addition to SAE J10, primarily regarding corrosion protection.

Section 1.1 has been revised to stress that SAE J10 provides MINIMUM requirements which may needto be revised and/or expanded to meet each specific application.

A finish paint is usually applied over the reservoir. An adhesion test was added to the exterior surfacerequirements in 4.2.1 to insure the adhesion of the finish paint. Also, the welded areas should be

considered as part of the corrosion evaluation. The benefits of any type of protective coating are greatlydiminished if areas are left unprotected.

A few minor revisions and updates were made. The ASTM specifications were updated to their currentrevisions in 2.1.1 and 4.2. A note in 4.1.2 was clarified and moved 3.1. The rated working pressure inSection 5 was revised to include the metric conversion, 1034 kPa (150 psi). A hard conversion to metricunits is not considered appropriate at this time for this product.

Relationship of SAE Standard to ISO StandardNot applicable.

ApplicationThis SAE Standard applies to all new production air brake reservoirs used in automotive

vehicles and off-road machines. This document defines an air brake reservoir as a reservoir havingsingle or multiple compartments that is used for storage of compressed air. This document does notapply to accumulators or reservoirs for storage of gases other than compressed air.

The reservoirs tested per these requirements shall be selected from production stock and shall be

equipped with all permanently attached items such as mounting brackets and fitting bosses.

Reference Section

ASTM B 117-95Operating Salt Spray (Fog) Apparatus

ASTM D 1654-92Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments

Developed by the SAE Truck and Bus Supply and Control Components Subcommittee

Sponsored by the SAE Truck and Bus Brake Committee